This gas gauge BQ2013HSN-A514 charge controller from Texas Instruments monitors the state of the battery, calculates data, and optimizes performance to keep your batteries safe. Its typical operating supply voltage is 4.25 V. In order to ensure parts aren"t damaged by bulk packaging, this product comes in tube packaging to add a little more protection by storing the loose parts in an outer tube. This device has a typical operating supply voltage of 4.25 V. Its minimum operating supply voltage of 3 V, while its maximum is 6.5 V. This device runs on NiCD|NiMH|Lead-Acid. This battery gauge has an operating temperature range of 0 °C to 70 °C.